These sites focus on using Wikis in classroom. There are resources for teachers about Wikis, free websites to sign up for free Wiki spaces, Wiki tutorials, classroom ideas, and examples of actual Wikis in classrooms. There are links to eThemes Resources on Wikipedia in Student Research and Teaching Tips: Using Online Journals and Blogs.
Here is an interactive tour that introduces you to the functions of Wikispaces and demonstrates how to create your own wiki. Choose a topic from "Choose a Tour" from the top of a page to see the demonstration.
Here is free Wikispaces, no advertising to distract students, for teachers to sign up. Check out links in "Where can I learn more about how to use a wiki in education?" for resources on Wiki walk through and educational Wiki guide and resources.
This is a collaborative project among students from different schools on Thomas Friedman's book, The World is Flat. Includes teacher's blogs, resources, and student's product. NOTE: This site includes ads.
These websites are about using weblogs in the classroom. There are websites where teachers and students can sign up for their own blogs for free. There are also several articles that explain how teachers are using blogs in the classroom. Teachers should be especially cautious about giving out these links as students can access other blogs.